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三江南段-中南半岛特提斯蛇绿岩大地构造与成矿 被引量:10

Plate Tectonics and Mineralization of the Tethyan Ophiolite in the Southern Sanjiang and Indo-China Peninsular Area
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摘要 青藏高原东南部特提斯研究是世界地质研究的热点之一,而三江南段-中南半岛地区是该研究的薄弱而分散地区.因此在特提斯构造域背景下,结合地层学、岩石学、构造学及古生物学等前人成果资料,利用中小尺度构造解析,厘定蛇绿岩混杂带构造古地理并论述成矿规律具有重要意义.(1)在特提斯构造格局基础上,圈定出与蛇绿岩空间配套的构造岩浆带,并厘定了缝合带的展布和消减极性规律,建立了构造古地理图,从中可以看出古、中、新特提斯变形依次变弱.(2)古特提斯蛇绿岩带典型蛇绿岩区的地质构造解析研究表明其经历印支期以来多期强烈构造活动改造.(3)蛇绿岩带对部分重要矿产资源的形成及分布具有显著控制作用:蛇绿岩带内的超基性岩是岩浆型钴、镍矿带的重要成矿物质来源;洋壳关闭及板块碰撞过程中形成的与蛇绿岩带平行分布的大面积酸性岩浆是热液型钨锡矿带的重要物质来源;中新世前后的构造转折促进了全区热液型矿床的形成. The research about Tethys along the eastern boundary of the Qinghai-Tebit plateau arouses great interests of geologists from all over the world.However,geological jobs keep relatively inadequate and decentralized in the Sanjiang-Indo-China multinational area.Therefore,under the Tethyan tectonic background,it is significant to determine rules of tectonic geography and mineralization of the Tethyan ophiolite complex belt,and to discover the direct evidence of ocean plates based on the former research including its stratigraphy,petrology,structural geology and paleontology.Our study covers the following aspects: (1) The suture location and the subduction direction of different periods are concluded by connecting the tectonic magma belts with the orogenic belt.A geometric pattern of a more fragmentary ophiolite geography of the paleo-Tethys contrasting to that of meso-neo-Tethys can be found easily from the paleogeography.(2) The initial location of sutures greatly changed by events of Indo-Chinese epoch,Yanshanian epoch,and Himalayan epoch can be concluded from our research of the typical ophiolite outcrop area.(3) The formation and distribution of some important mineral resources are obviously controlled by the ophiolite complex belt.The ultra basic rock belts provide the ore material resources of magmatic cobalt and nickel metallogenic belt.The large area of acid magma formed during the course of the close and collision of plates,parallel to the ophiolite belt,is the important material resource of the hydrothermal wolfram and tin deposit belts.The formation of the regional hydrothermal deposits was improved by the transition of tectonic system around the Miocene.
作者 张宏远 刘俊来 ZHANG Hong-yuan1,2,3,LIU Jun-lai1,2 1.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China 2.School of the Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China 3.School of Earth Sciences,the University of Queensland,Steele Building,St Lucia.,Brisbane 4072,Australia
出处 《地球科学:中国地质大学学报》 EI CAS CSCD 北大核心 2011年第2期262-276,共15页 Earth Science-Journal of China University of Geosciences
基金 国家科技支撑计划项目(No.2006BAB01A03-3-2) 中国地质调查局项目(No.200811008) 国家自然科学重点基金项目(No.90814006)
关键词 特提斯蛇绿岩 大地构造 构造转折 成矿作用 the Tethyan ophiolite plate tectonics transition of tectonic system mineralization.
作者简介 张宏远(1977-),男,讲师,构造地质学专业.Email:zhanghongyuan@cugb.edu.cn
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